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# PyEPL: repository.py
#
# Copyright (C) 2003-2005 Michael J. Kahana
# Authors: Ian Schleifer, Per Sederberg, Aaron Geller, Josh Jacobs
# URL: http://memory.psych.upenn.edu/programming/pyepl
#
# Distributed under the terms of the GNU Lesser General Public License
# (LGPL). See the license.txt that came with this file.
"""
The repository module.
"""
import weakref
nopickle = []
class WeakRef:
"""
An extension of the ref class that can be pickled.
"""
def __init__(self, *targs, **dargs):
"""
"""
self.r = weakref.ref(*targs, **dargs)
def __getattr__(self, name):
"""
"""
return getattr(self.r, name)
def __getstate__(self):
"""
"""
return self.r()
def __setstate__(self, state):
"""
"""
self.r = weakref.ref(state)
class WeakKeyDictionary(weakref.WeakKeyDictionary):
"""
An extension of the WeakKeyDictionary class that can be pickled.
"""
def __getstate__(self):
"""
Returns a regular dictionary version of the WeakKeyDictionary.
"""
global nopickle
d = dict(self)
for key, value in d.items():
if type(key) in nopickle:
del d[key]
return d
def __setstate__(self, state):
"""
Constructs WeakKeyDictionary from state dictionary.
"""
weakref.WeakKeyDictionary.__init__(self, state)
class WeakValueDictionary(weakref.WeakValueDictionary):
"""
An extension of the WeakValueDictionary class that can be pickled.
"""
def __getstate__(self):
"""
Returns a regular dictionary version of the WeakKeyDictionary.
"""
global nopickle
d = dict(self)
for key, value in d.items():
if type(value) in nopickle:
del self[key]
return dict(self)
def __setstate__(self, state):
"""
Constructs WeakKeyDictionary from state dictionary.
"""
weakref.WeakValueDictionary.__init__(self, state)
class MethodCallback:
"""
"""
def __init__(self, m):
"""
"""
self.name = m.im_func.__name__
self.obj = m.im_self
def __call__(self, *targs, **dargs):
"""
"""
getattr(self.obj, self.name)(*targs, **dargs)
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